drone

Hi,
i fertilize organically with the skin of the banana fruit. i usw other stuff but these skins are full of potassium which I need as an organic gardener. but it just occurred to me that these bananas are coming from plantations across the world with god knows how many pests and diseases. w
can Panama disease of Fusarium oxysporum spread via the skin of a banana fruit? as it's now all across the world.
if so I'm am screwed as I'm growing varieties such as gross Michel which are vulnerable to been basic strains of the Panama disease (tr1)
i know it can spread through soil and infected material but does the fruit skin of the banana have that?
i know that fruit doesn't normally develop however, what if a plant has fruited and is just about to be harvested and only then develops symptoms? surely its a risk using banans skins if it can transmit this banana 'cancer'. even other diseases also e.g black sigatoka. can they spread via the skin?

let me know what you think as I'm scared I've killed my banana collection
thanks